Intravenous oxytocin is the recommended uterotonic drug for the treatment of PPH. If intravenous oxytocin is unavailable, or if the bleeding does not respond to oxytocin, the use of intravenous ergometrine, oxytocin-ergometrine fixed dose, or a prostaglandin drug (including sublingual misoprostol, 800 μg) is recommended. This evidence concerns the gene OXT and pulmonary arterial hypertension.